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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>学习TS</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        html,
        body,
        #app {
            height: 100%;
        }

        .txt {
            font-size: 40px;
            padding-top: 20px;
            text-align: center;
            font-weight: bold;
        }
    </style>
</head>

<body>
    <div id="app">
        <p class='txt'>学无止境 ○ TypeScript</p>
    </div>
</body>

</html>